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Volatile organic compounds (VOCs) were analyzed in air and snow samples atthe Jungfraujoch high alpine research station in Switzerland as part ofCLACE 5 (CLoud and Aerosol Characterization Experiment) duringFebruary/March 2006. The fluxes of individual compounds in ambient air werecalculated from gas phase concentrations and wind speed. The highestconcentrations and flux values were observed for the aromatic hydrocarbonsbenzene (14.3 μg.m−2 s−1), 1,3,5-trimethylbenzene(5.27 μg.m−2 s−1), toluene (4.40 μg.m−2 −1), and the aliphatic hydrocarbonsi-butane (7.87 μg.m−2 s−1), i-pentane (3.61 μg.m−2 s−1)and n-butane (3.23 μg.m−2 s−1). The measuredconcentrations and fluxes were used to calculate the efficiency of removalof VOCs by snow, which is defined as difference between the initial andfinal concentration/flux values of compounds before and after wetdeposition. The removal efficiency was calculated at −24°C (−13.7°C) and ranged from 37% (35%) for o-xylene to 93% (63%) fori-pentane. The distribution coefficients of VOCs between the air and snowphases were derived from published poly-parameter linear free energyrelationship (pp-LFER) data, and compared with distribution coefficientsobtained from the simultaneous measurements of VOC concentrations in air andsnow at Jungfraujoch. The coefficients calculated from pp-LFER exceededthose values measured in the present study, which indicates more efficientsnow scavenging of the VOCs investigated than suggested by theoreticalpredictions

Distribution of VOCs between air and snow at the Jungfraujoch high alpine research station, Switzerland, during CLACE 5 (winter 2006)